Question Detail

It is time to do our business.

It is time for our business to be done.
It is time to our business to be done.
It is time our business to be done.
It is time for our business be done.

Answer: Option A

Explanation:

Note: Please note the use of "for"

1. Who taught you English ?

By who were you taught English.
By which were you taught English.
By whom you were taught English ?
By whom were you taught English ?

Answer: Option D

2. He is making a film.

A film is made by him.
A film had being made by him.
A film is being made by him.
A film has being made by him.

Answer: Option C

Explanation:

Note : Rule to make active voice of Present Continuous Tense :

Passive subject + is/are/am + being + third form of verb + by + passive object

3. We must have obeyed our teachers.

Our teachers might have obeyed.
Our teachers might have been obeyed.
Our teachers must have been obeyed.
Our teachers must have obeyed.

Answer: Option C

Explanation:

If we have "Subject + Modal Auxiliary verb + have + third verb + object"
then we change it to

Passive subject + Modal Auxiliary verb + have been + third form + by + passive object.

Modal Auxiliary verb are : can, could, shall, will, may, might, should, would, must, ought to etc.